| /* |
| * Copyright (C) 2016 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package android.os.health; |
| |
| import android.content.Context; |
| import android.os.BatteryStats; |
| import android.os.Process; |
| import android.os.RemoteException; |
| import android.os.ServiceManager; |
| |
| import com.android.internal.app.IBatteryStats; |
| |
| /** |
| * Provides access to data about how various system resources are used by applications. |
| * @more |
| * <b>Battery Usage</b><br> |
| * The statistics related to power (battery) usage are recorded since the device |
| * was last unplugged. It is expected that applications schedule more work to do |
| * while the device is plugged in (e.g. using {@link android.app.job.JobScheduler |
| * JobScheduler}), and while that can affect charging rates, it is still preferable |
| * to actually draining the battery. |
| */ |
| public class SystemHealthManager { |
| private final IBatteryStats mBatteryStats; |
| |
| /** |
| * Construct a new SystemHealthManager object. |
| * @hide |
| */ |
| public SystemHealthManager() { |
| mBatteryStats = IBatteryStats.Stub.asInterface( |
| ServiceManager.getService(BatteryStats.SERVICE_NAME)); |
| } |
| |
| /** |
| * Obtain a SystemHealthManager object for the supplied context. |
| */ |
| public static SystemHealthManager from(Context context) { |
| return (SystemHealthManager)context.getSystemService(Context.SYSTEM_HEALTH_SERVICE); |
| } |
| |
| /** |
| * Return a {@link HealthStats} object containing a snapshot of system health |
| * metrics for the given uid (user-id, which in usually corresponds to application). |
| * @more |
| * |
| * An application must hold the {@link android.Manifest.permission#BATTERY_STATS |
| * android.permission.BATTERY_STATS} permission in order to retrieve any HealthStats |
| * other than its own. |
| * |
| * @param uid User ID for a given application. |
| * @return A {@link HealthStats} object containing the metrics for the requested |
| * application. The keys for this HealthStats object will be from the {@link UidHealthStats} |
| * class. |
| * @see Process#myUid() |
| */ |
| public HealthStats takeUidSnapshot(int uid) { |
| try { |
| final HealthStatsParceler parceler = mBatteryStats.takeUidSnapshot(uid); |
| return parceler.getHealthStats(); |
| } catch (RemoteException ex) { |
| throw new RuntimeException(ex); |
| } |
| } |
| |
| /** |
| * Return a {@link HealthStats} object containing a snapshot of system health |
| * metrics for the application calling this API. This method is the same as calling |
| * {@code takeUidSnapshot(Process.myUid())}. |
| * |
| * @return A {@link HealthStats} object containing the metrics for this application. The keys |
| * for this HealthStats object will be from the {@link UidHealthStats} class. |
| */ |
| public HealthStats takeMyUidSnapshot() { |
| return takeUidSnapshot(Process.myUid()); |
| } |
| |
| /** |
| * Return a {@link HealthStats} object containing a snapshot of system health |
| * metrics for the given uids (user-id, which in usually corresponds to application). |
| * @more |
| * |
| * An application must hold the {@link android.Manifest.permission#BATTERY_STATS |
| * android.permission.BATTERY_STATS} permission in order to retrieve any HealthStats |
| * other than its own. |
| * |
| * @param uids An array of User IDs to retrieve. |
| * @return An array of {@link HealthStats} objects containing the metrics for each of |
| * the requested uids. The keys for this HealthStats object will be from the |
| * {@link UidHealthStats} class. |
| */ |
| public HealthStats[] takeUidSnapshots(int[] uids) { |
| try { |
| final HealthStatsParceler[] parcelers = mBatteryStats.takeUidSnapshots(uids); |
| final HealthStats[] results = new HealthStats[uids.length]; |
| final int N = uids.length; |
| for (int i=0; i<N; i++) { |
| results[i] = parcelers[i].getHealthStats(); |
| } |
| return results; |
| } catch (RemoteException ex) { |
| throw new RuntimeException(ex); |
| } |
| } |
| |
| } |
| |